# subscriptions.duplicates.check

On demand, find plans billed by the same vendor in one currency: name rules first, then the Classifier over every plan's normalized merchant descriptor, dates and amounts, then a second opinion on uncertain groups. Never sends raw names, payee names, receipts, accounts or notes. Saves suggestions only; nothing is merged.

`POST /api/v1/accounting/subscriptions.duplicates.check`

Permissions: `accounting:read`, `accounting:write` · Roles: admin, finance · Idempotency key required

MCP tool: `accounting_subscriptions_duplicates_check`

## Fields

| Field | Type | Required | Notes |
| --- | --- | --- | --- |
| `idempotencyKey` | string | Yes | Any unique text you generate once per intended change, so a retried request only happens once. Send it as the Idempotency-Key header instead if you prefer; if you send both they must match. 8–200 characters. |

## Example request

```bash
curl https://app.getoatmilk.com/api/v1/accounting/subscriptions.duplicates.check \
  -H "Authorization: Bearer $OATMILK_API_KEY" \
  -H "Content-Type: application/json" \
  -H "Idempotency-Key: $(uuidgen)" \
  -d '{}'
```

Reference page: https://app.getoatmilk.com/docs/api/subscriptions.duplicates.check